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Biological assets - Non-current and current biological assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about biological assets [line items]      
Non-current biological assets $ 11,276 $ 8,516  
Current biological assets 156,718 136,888  
Biological assets 167,994 145,404 $ 111,818
Cattle for dairy production      
Disclosure of detailed information about biological assets [line items]      
Biological assets 8,989 6,584  
Cattle for dairy production | Mature biological assets      
Disclosure of detailed information about biological assets [line items]      
Non-current biological assets 8,989 6,584  
Breeding cattle      
Disclosure of detailed information about biological assets [line items]      
Biological assets 3,713 2,034  
Breeding cattle | Mature biological assets      
Disclosure of detailed information about biological assets [line items]      
Non-current biological assets 1,984 1,533  
Current biological assets 1,729 501  
Other cattle      
Disclosure of detailed information about biological assets [line items]      
Biological assets 652 642  
Other cattle | Mature biological assets      
Disclosure of detailed information about biological assets [line items]      
Current biological assets 349 243  
Other cattle | Immature biological assets      
Disclosure of detailed information about biological assets [line items]      
Non-current biological assets 303 399  
Sown land – crops      
Disclosure of detailed information about biological assets [line items]      
Biological assets 31,745 28,189  
Sown land – crops | Immature biological assets      
Disclosure of detailed information about biological assets [line items]      
Current biological assets 31,745 28,189  
Sown land – rice      
Disclosure of detailed information about biological assets [line items]      
Biological assets 29,717 25,575  
Sown land – rice | Immature biological assets      
Disclosure of detailed information about biological assets [line items]      
Current biological assets 29,717 25,575  
Sown land – sugarcane      
Disclosure of detailed information about biological assets [line items]      
Biological assets 93,178 82,380  
Sown land – sugarcane | Immature biological assets      
Disclosure of detailed information about biological assets [line items]      
Current biological assets $ 93,178 $ 82,380